A Reddit user has launched PopUpFactCheck, a free Chrome extension that fact-checks claims in YouTube videos as you watch. The tool scans English subtitles, extracts statements to verify, and within seconds displays a verdict right over the video player. The idea quickly caught on-a Reddit post about it has racked up over 1,000 reactions and nearly 200 comments in just three days.
PopUpFactCheck’s interface is straightforward: a green bubble means the claim is likely true, red flags a false statement, and yellow signals misleading wording. It works not just on regular uploads but also live streams, making it usable during news broadcasts, speeches, and press conferences.
The creator says the extension tries to differentiate facts from opinions, metaphors, and rhetoric to avoid debating what can’t be objectively verified. It cross-checks claims against what it calls authoritative sources-government data, news agencies, and fact-checking organizations. The developer stresses that the same criteria apply to all speakers, and that PopUpFactCheck doesn’t collect user data, activating only when watching YouTube videos.
How PopUpFactCheck works
- Chrome extension tailored for YouTube videos and live streams
- Analyzes English-language subtitles in videos and live content
- Delivers fact-check verdict overlays within seconds over the video player
- Uses color-coded bubbles: green (likely true), red (false), yellow (misleading)
- Free with a daily limit on the number of fact-checks
- $10/month subscription removes usage limits
PopUpFactCheck taps into a growing effort by platforms to mark questionable statements in video content without manually moderating every clip. YouTube began testing its own Community Notes in 2024, allowing users to add contextual annotations, while Twitter (now X) and Meta are building similar systems on their networks. Unlike those, PopUpFactCheck runs on top of the existing YouTube player, offering near real-time fact-check feedback.
This approach is especially relevant considering YouTube’s massive reach-industry estimates put monthly active users at over 2.5 billion worldwide. Political interviews, live streams, and news shows have become hotbeds for contentious claims, fueling demand for automated fact-checking tools. The main challenges for systems like this lie in subtitle accuracy, processing speed, and the reliability of their chosen data sources.
Currently, PopUpFactCheck supports only English subtitles, limiting its effectiveness for other languages or videos without proper captions. If the developer expands language support and maintains the $10 monthly price point, the extension could carve out a niche among frequent viewers of political and news content on YouTube. For wider appeal, the real test will be whether its green and red bubbles prove more reliable than the creators’ own claims.
* Meta, the parent company of Facebook and Instagram, is banned and labeled an extremist organization in Russia.